4.1 failure after steady operation

F

Fenichel

Well-known member
After several days of continuous operation, not connected to USB, in an application described elsewhere , a Teensy 4.1 (S/N 1532053) abruptly froze, with its USB-proximate LED flashing in groups of 4. Power-cycling didn't help, but when I reconnected the Teensy to the Teensyduino IDE, I was able to reload and restart it without difficulty. How should I treat this Teensy now?
 
4 blinks usually means an issue with the crystal. Might be a good idea to inspect that area for debris or leftover flux from soldering nearby pins.
 
PaulStoffregen said:
4 blinks usually means an issue with the crystal. Might be a good idea to inspect that area for debris or leftover flux from soldering nearby pins.
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The area looks clean to me, even under magnification. I have blown the whole unit with compressed air anyway.
If there is another freeze, I'll probably be able to revive this Teensy again, but is there any sort of informative probing that I might do before resuscitation?
 
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